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列

借助我们的flexbox网格系统，了解如何使用一些对齐，排序和偏移选项来修改列。另外，请参阅如何使用列类来管理非网格元素的宽度。

在本页面
注意！ 在深入了解如何修改和自定义网格列之前，请务必先 阅读网格页 。

他们如何工作

  • 列构建在网格的flexbox体系结构上。 Flexbox意味着我们可以 在行级别更改单个列和修改列组。 您可以选择列的增长、收缩或其他更改方式。

  • 在构建网格布局时，所有内容都列在列中。Bootstrap网格的层次结构从 容器 到行再到列再到内容。在极少数情况下，您可以结合使用内容和列，但要注意可能会产生意想不到的后果。

  • Bootstrap包含用于创建快速，响应式布局的预定义类。 每个网格层有 6个断点和十几列，我们已经为您构建了几十个类来创建所需的布局。如果您愿意，可以通过Sass禁用此功能。

对齐

使用flexbox对齐工具可垂直和水平对齐列。

垂直对齐

One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns 
<div class="container">
  <div class="row align-items-start">
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
  </div>
  <div class="row align-items-center">
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
  </div>
  <div class="row align-items-end">
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
    <div class="col">
      One of three columns
    </div>
  </div>
</div>
One of three columns
One of three columns
One of three columns 
<div class="container">
  <div class="row">
    <div class="col align-self-start">
      One of three columns
    </div>
    <div class="col align-self-center">
      One of three columns
    </div>
    <div class="col align-self-end">
      One of three columns
    </div>
  </div>
</div>

水平对齐

One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns 
<div class="container">
  <div class="row justify-content-start">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-center">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-end">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-around">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-between">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
  <div class="row justify-content-evenly">
    <div class="col-4">
      One of two columns
    </div>
    <div class="col-4">
      One of two columns
    </div>
  </div>
</div>

列包装

如果在一行中放置超过12列，则每组额外的列将作为一个单元包装到新行上。

.col-9
.col-4
Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-6
Subsequent columns continue along the new line.
<div class="container">
  <div class="row">
    <div class="col-9">.col-9</div>
    <div class="col-4">.col-4<br>Since 9 + 4 = 13 &gt; 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.</div>
    <div class="col-6">.col-6<br>Subsequent columns continue along the new line.</div>
  </div>
</div>

分栏符

在flexbox中将列拆分为新行需要一个小技巧：添加一个 width: 100%，无论您想在哪里将列包装到新行。通常这是通过多个 .row来完成的，但并非每种实现方法都可以解决这个问题。

.col-6 .col-sm-3
.col-6 .col-sm-3
.col-6 .col-sm-3
.col-6 .col-sm-3
<div class="container">
  <div class="row">
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>

    <!-- Force next columns to break to new line -->
    <div class="w-100"></div>

    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
    <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
  </div>
</div>

您也可以使用我们的响应式显示实用程序在特定的断点处应用此中断。

.col-6 .col-sm-4
.col-6 .col-sm-4
.col-6 .col-sm-4
.col-6 .col-sm-4
<div class="container">
  <div class="row">
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>

    <!-- Force next columns to break to new line at md breakpoint and up -->
    <div class="w-100 d-none d-md-block"></div>

    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
    <div class="col-6 col-sm-4">.col-6 .col-sm-4</div>
  </div>
</div>

重新排序

排序类

使用 .order-类来控制内容的 视觉顺序 。这些类是响应式的，因此您可以按断点设置 order （例如，.order-1.order-md-2）。包括对所有6个网格层的1 到 5 的支持。

First in DOM, no order applied
Second in DOM, with a larger order
Third in DOM, with an order of 1 
<div class="container">
  <div class="row">
    <div class="col">
      First in DOM, no order applied
    </div>
    <div class="col order-5">
      Second in DOM, with a larger order
    </div>
    <div class="col order-1">
      Third in DOM, with an order of 1
    </div>
  </div>
</div>

还有响应的 .order-first 和 .order-last 类 ，它们分别通过应用 order: -1 和 order: 6来更改元素的order。这些类也可以根据需要与编号的 .order-*类混合使用。

First in DOM, ordered last
Second in DOM, unordered
Third in DOM, ordered first 
<div class="container">
  <div class="row">
    <div class="col order-last">
      First in DOM, ordered last
    </div>
    <div class="col">
      Second in DOM, unordered
    </div>
    <div class="col order-first">
      Third in DOM, ordered first
    </div>
  </div>
</div>

偏移列

您可以通过两种方式偏移网格列：我们的响应.offset-网格类和 边距实用程序。网格类的大小可匹配列，而边距对于偏移宽度可变的快速布局更有用。

偏移类

使用.offset-md-*类将列向右移动。这些类将列的左边距增加* 列。 例如， .offset-md-4 移至 .col-md-4四列。

.col-md-4
.col-md-4 .offset-md-4
.col-md-3 .offset-md-3
.col-md-3 .offset-md-3
.col-md-6 .offset-md-3
<div class="container">
  <div class="row">
    <div class="col-md-4">.col-md-4</div>
    <div class="col-md-4 offset-md-4">.col-md-4 .offset-md-4</div>
  </div>
  <div class="row">
    <div class="col-md-3 offset-md-3">.col-md-3 .offset-md-3</div>
    <div class="col-md-3 offset-md-3">.col-md-3 .offset-md-3</div>
  </div>
  <div class="row">
    <div class="col-md-6 offset-md-3">.col-md-6 .offset-md-3</div>
  </div>
</div>

除了在响应断点处清除列之外，还可能需要重置偏移量。在 网格示例中可以看到这一点。

.col-sm-5 .col-md-6
.col-sm-5 .offset-sm-2 .col-md-6 .offset-md-0
.col-sm-6 .col-md-5 .col-lg-6
.col-sm-6 .col-md-5 .offset-md-2 .col-lg-6 .offset-lg-0
<div class="container">
  <div class="row">
    <div class="col-sm-5 col-md-6">.col-sm-5 .col-md-6</div>
    <div class="col-sm-5 offset-sm-2 col-md-6 offset-md-0">.col-sm-5 .offset-sm-2 .col-md-6 .offset-md-0</div>
  </div>
  <div class="row">
    <div class="col-sm-6 col-md-5 col-lg-6">.col-sm-6 .col-md-5 .col-lg-6</div>
    <div class="col-sm-6 col-md-5 offset-md-2 col-lg-6 offset-lg-0">.col-sm-6 .col-md-5 .offset-md-2 .col-lg-6 .offset-lg-0</div>
  </div>
</div>

边距实用程序

通过在v4中迁移到flexbox，您可以使用诸如.me-auto之类的边距实用程序强制同级列彼此分离。

.col-md-4
.col-md-4 .ms-auto
.col-md-3 .ms-md-auto
.col-md-3 .ms-md-auto
.col-auto .me-auto
.col-auto
<div class="container">
  <div class="row">
    <div class="col-md-4">.col-md-4</div>
    <div class="col-md-4 ms-auto">.col-md-4 .ms-auto</div>
  </div>
  <div class="row">
    <div class="col-md-3 ms-md-auto">.col-md-3 .ms-md-auto</div>
    <div class="col-md-3 ms-md-auto">.col-md-3 .ms-md-auto</div>
  </div>
  <div class="row">
    <div class="col-auto me-auto">.col-auto .me-auto</div>
    <div class="col-auto">.col-auto</div>
  </div>
</div>

独立列类

.col-*类也可以在.row外部使用，为元素提供特定的宽度。 当列类用作行的非直接子级时，将忽略填充。

.col-3: width of 25%
.col-sm-9: width of 75% above sm breakpoint 
<div class="col-3 bg-light p-3 border">
  .col-3: width of 25%
</div>
<div class="col-sm-9 bg-light p-3 border">
  .col-sm-9: width of 75% above sm breakpoint
</div>

这些类可以与实用程序一起使用来创建响应的浮动图像。如果文本较短，请确保将内容包装在 .clearfix 包装器中以清除浮动。

PlaceholderResponsive floated image

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<div class="clearfix">
  <img src="..." class="col-md-6 float-md-end mb-3 ms-md-3" alt="...">

  <p>
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  </p>

  <p>
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  </p>

  <p>
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  </p>
</div>